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gh-116322: Add Py_mod_gil module slot (#116882)

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This PR adds the ability to enable the GIL if it was disabled at
interpreter startup, and modifies the multi-phase module initialization
path to enable the GIL when loading a module, unless that module's spec
includes a slot indicating it can run safely without the GIL.

PEP 703 called the constant for the slot `Py_mod_gil_not_used`; I went
with `Py_MOD_GIL_NOT_USED` for consistency with gh-104148.

A warning will be issued up to once per interpreter for the first
GIL-using module that is loaded. If `-v` is given, a shorter message
will be printed to stderr every time a GIL-using module is loaded
(including the first one that issues a warning).
This commit is contained in:
Brett Simmers 2024-05-03 08:30:55 -07:00 • committed by GitHub
parent 3e818afb9b
commit c2627d6eea
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123 changed files with 376 additions and 62 deletions
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16
Include/moduleobject.h
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@ -76,9 +76,13 @@ struct PyModuleDef_Slot {
#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x030c0000
# define Py_mod_multiple_interpreters 3
#endif
#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x030d0000
# define Py_mod_gil 4
#endif
#ifndef Py_LIMITED_API
#define _Py_mod_LAST_SLOT 3
#define _Py_mod_LAST_SLOT 4
#endif
#endif /* New in 3.5 */
@ -90,6 +94,16 @@ struct PyModuleDef_Slot {
# define Py_MOD_PER_INTERPRETER_GIL_SUPPORTED ((void *)2)
#endif
/* for Py_mod_gil: */
#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x030d0000
# define Py_MOD_GIL_USED ((void *)0)
# define Py_MOD_GIL_NOT_USED ((void *)1)
#endif
#if !defined(Py_LIMITED_API) && defined(Py_GIL_DISABLED)
PyAPI_FUNC(int) PyModule_ExperimentalSetGIL(PyObject *module, void *gil);
#endif
struct PyModuleDef {
PyModuleDef_Base m_base;
const char* m_name;